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<html>
<head><title>DEFINE-PC-MACRO.html -- ACL2 Version 3.1</title></head>
<body text=#000000 bgcolor="#FFFFFF">
<h2>DEFINE-PC-MACRO</h2>define a proof-checker macro command
<pre>Major Section: <a href="PROOF-CHECKER.html">PROOF-CHECKER</a>
</pre><p>
<pre>
Example:
(define-pc-macro ib (&optional term)
(value
(if term
`(then (induct ,term) bash)
`(then induct bash))))
</pre>
The example above captures a common paradigm: one attempts to prove
the current goal by inducting and then simplifying the resulting
goals. (see <a href="PROOF-CHECKER-COMMANDS.html">proof-checker-commands</a> for documentation of the
command <code>then</code>, which is itself a pc-macro command, and commands
<code>induct</code> and <code>bash</code>.) Rather than issuing <code>(then induct bash)</code>, or
worse yet issuing <code>induct</code> and then issuing <code>bash</code> for each resulting
goals, the above definition of <code>ib</code> would let you issue <code>ib</code> and get the
same effect.
<p>
<pre>
General Form:
(define-pc-macro cmd args doc-string dcl ... dcl body)
</pre>
where <code>cmd</code> is the name of the pc-macro than you want to define,
<code>args</code> is its list of formal parameters. <code>Args</code> may include lambda-list
keywords <code>&optional</code> and <code>&rest</code>; see <a href="MACRO-ARGS.html">macro-args</a>, but note that
here, <code>args</code> may not include <code>&key</code> or <code>&whole</code>.<p>
The value of <code>body</code> should be an ACL2 ``error triple,'' i.e., have the
form <code>(mv erp xxx state)</code> for some <code>erp</code> and <code>xxx</code>. If <code>erp</code> is
<code>nil</code>, then <code>xxx</code> is handed off to the proof-checker's instruction
interpreter. Otherwise, evaluation typically halts. We may write
more on the full story later if there is interest in reading it.
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